173

This number is a prime.

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+ The only prime whose sum of cubed digits equals its reversal: 13 + 73 + 33 = 371. [Beedassy]

+ There are in all 173 distinct configurations on a Euclidean plane for the arrangement of 4 circles, not necessarily all identical, not allowing osculations nor three or more common intersection points. [Note configuration here means circle-drawable, not just topologically distinct] [Beedassy]

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